High-Strength Chromium Zirconium Copper Square Tubes – C18150

Short Description:

Product Specifications
Name： Chromium Zirconium Copper Square Tube (CuCrZr Square Tubing)
Standard： ASTM B768, RWMA Class 2, UNS C18150, RoHS Compliant, REACH Compliant
Material： C18150 (Chromium Zirconium Copper, Cr 0.5-1.5%, Zr 0.03-0.3%)
Surface： Precision Drawn or Machined, Smooth Internal & External Finish
Outer Side Length： 20mm – 150mm
Wall Thickness： 2mm – 20mm
Length： 1000mm – 6000mm (custom lengths available)
Product Features:
Excellent electrical and thermal conductivity · Superior strength retention at high temperatures · Outstanding softening and wear resistance · High fatigue strength under cyclic loading · Reliable performance in repeated heating/cooling cycles · Good machinability and dimensional stability · Consistent properties across square hollow sections
Application Field:
Resistance welding electrode cooling tubes, Plastic injection mold cooling channels, High-current electrical conduits, Heat exchangers in high-temperature environments, Spot welding gun components, Die casting plunger cooling, Power generation cooling systems, Aerospace heat transfer parts

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Chromium Zirconium Copper Square Tube – Process & Quality Assurance Statement
Our chromium zirconium copper square tubes are specifically developed for applications requiring sustained conductivity and mechanical strength at elevated temperatures, where standard copper would soften or lose performance.

Key process features

Production employs advanced metallurgical and extrusion techniques to maintain uniform properties in square hollow sections:

●Alloy Preparation: High-purity copper is alloyed with precise chromium and zirconium additions in controlled induction furnaces under protective atmosphere.
●Casting: Semi-continuous casting produces large billets or hollow billets with homogeneous composition and minimal segregation.
●Hot Extrusion: High-tonnage presses extrude the material into square tubes, refining grain structure and achieving high density.
●Solution Heat Treatment: Tubes are solution annealed at high temperature and rapidly quenched to create a supersaturated matrix.
●Precipitation Aging: Controlled low-temperature aging develops optimal hardness, strength, and conductivity balance.
●Cold Drawing & Sizing: Multiple controlled draw passes refine dimensions, improve surface finish, and enhance straightness.
●Final Cutting & Protection: Tubes are cut to length, ends deburred, and lightly oiled to prevent oxidation during storage and global shipping.

Quality control system

● Full traceability from raw alloy melt to finished square tube
● Comprehensive material test certificates and heat treatment reports supplied with every shipment
● Sample retention ≥3 years for third-party verification (SGS, BV, TÜV, etc.)
● 100% inspection of critical parameters:
• Chemical composition (optical emission spectrometry)
• Mechanical properties (tensile, hardness, and conductivity tested at multiple locations)
• Dimensional accuracy (ultrasonic wall thickness + micrometers; typical tolerance ±1% on side/wall)
• Surface finish and ovality (profilometer + visual checks)
• Internal soundness (full ultrasonic scanning)
● Internal standards exceed ASTM B768 requirements. Typical C18150 aged properties:
Tensile strength ≥450 MPa, Hardness ≥140 HB, Electrical conductivity ≥80% IACS, Excellent stability up to 500°C without significant softening.
● ISO 9001:2015 certified facility ensures every chromium zirconium copper square tube delivers consistent, reliable performance in your most demanding high-temperature and high-conductivity applications.